New material filling a mold forms a(n) ______________ of the original shell or bone
Fill in the blank(s) with correct word
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How many grams of water can be produced from the combination of 25.0 grams of hydrogen and 225 grams of oxygen?
A) 250 grams B) 225 grams C) 200 grams D) 25 grams
Galileo's use of inclined planes allowed him to effectively
A) slow down the ball's changes in speed. B) reduce the time of the ball's changes in speed. C) eliminate all changes in speed. D) eliminate friction.
A 3.0-kg block is dragged over a rough horizontal surface by a constant force of 16 N acting at an angle of 37° above the horizontal as shown. The speed of the block increases from 4.0 m/s to 6.0 m/s in a displacement of 5.0 m. What work was done by the friction force during this displacement?
a.
?34 J
b.
?64 J
c.
?30 J
d.
?94 J
e.
+64 J
A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2 . In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
a. 2.5 s b. 4.0 s c. 3.5 s d. 3.0 s e. 4.5 s